When too much rain falls for the ground to absorb, it runs downhill, pulled by gravity into streams, creeks and rivers.

At least 80 people are dead and many more are missing in Texas in the wake of torrential rains and resulting flooding. By far the greatest number of fatalities occurred in Kerr County, where 68 people are believed to be dead, according to officials, including 28 children.

At least 67 people are dead following flooding that slammed central Texas over the weekend, while a desperate search for 11 missing girls continues.